EF：如何为具有GradeId = 1的“学生”获取“成绩”实体

Question

我在数据库结构下面有数据，

下面是entity和dbContext类，

public class SchoolContext : DbContext
{
    public DbSet<Grade> Grades { get; set; }
    public DbSet<Student> Students { get; set; }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer(@"Server=(localdb)\MSSQLLocalDB;Database=SchoolDB;Trusted_Connection=True;");
    }
}

public class Grade
{
    public int Id { get; set; }
    public string GradeName { get; set; }

    public virtual ICollection<Student> Students { get; set; } = new HashSet<Student>();
}

public class Student
{
    public int Id { get; set; }
    public string StudentName { get; set; }
}

现在，我正在尝试获取Grade的{​​{1}}实体，其GradeId = 1。如何通过GradeId？

Student

Answer 1

似乎您实际上是在尝试获得ID等于1的成绩并预加载相关数据。因此，您可以尝试以下方法：

CFSocketConnectToAddress(self.socket, sin_cfd, -1)

Answer 2

一种可能的解决方案：

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